John wolke



m0140441.) J. WOLKB.

MACHINE BRAKE.

No. 414,469. Patented Nav.A 5, 1889.

'UNITED STATES PATENT OFFICE.

JOHN VOLKE, OF JACKSONVILLE, ILLINOIS, ASSIGNOR OF ONE-FIFTH TO DANIEL E. PIERSON, OF SAME PLACE.

MAoHlN-BRAKE.

SPECIFICATION forming part of Letters Patent No. 414,469, dated November 5, 1889.

Original application filed May 19, 1888, Serial No. 274,375. Divided and this application filed May 27, 1889. Serial No. 312,294. (No model.)

To a/Z wiz/0712, it mayconccrn.-

Be it known that I, JOHN WOLKE, a citizen of the United States, residing at Jacksonville, in the county of Morgan and State of Illinois, have invented certain new and useful Improveni ents in Machine-Brakes; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use thesame.

My invention relates, generally, to machinebrakes, and particularly to a two-part annular clamp-brake for applying frictional resistance to shafts, disks, pulleys, wheels, and otherl revoluble surfaces. Y

The machine in which I prefer to employ my present invention is the windmill which forms the subject-matter of another application for Letters Patent filed by me May 19, 1888, Serial No. 274,375, of wh ich application this one is a division.

My said present invention consists in the improved construction and arrangement. or combination of parts hereinafter fully disclosed in the description, drawings, and claims.

The objects Yof my invention are, first, to provide novel and improved mechanism for promptly and yet gradually applying frictional resistance to the peripheries of shafts, disks, pulleys, wheels, and other revoluble surfaces second, to provide a two-part springactuated clamp-brake, which revolves with a shaft, disk, pulley, or wheel, with improved devices for stopping the same; third, to provide improved means for gradually increasing the frictional resistance of said clampbrake upon the surface to which it is applied, and, fourth, to provide improved means for raising and lowering the dog or stop -bolt for releasing and applying said clamp-brake. These objects are attained by the mechanism illustrated in the accompanying drawings, forming part of this specification, in which the same reference-numerals indicate the same parts, and in which- Figure l represent-s a rear face view of my improved brake mechanism; Fig. :2, a vertical section of the saine on the line a of Fig. l; Fig-3, a detail view of the two-part clampbrake, and Fig. a a detail perspective View of the trigger or trip.

In the drawings, the numeral l indicates a revoluble shaft, upon which, for instance, a pulley or disk is secured. A clamp-brake 3, which is composed of two s'emicircular bands 4, provided at their respective ends with outwardly-projecting longitudinallyslotted casings 5 and lugs 6, the latter being adapted to fit and slide within said slotted casings, is placed around said disk 2. Coiled springs '7 are located within these vslotted casings between said lugs and the set-screws 8. The latter pass through the ends of said casings, press against said springs and yieldingly hold the clamp-brake around the rim of the disk 2. The clamping force of this brake may be adjusted by the set-screws S, which serve to regulate the tension or pressure of the springs 7.

An upright casting or frame 9 serves to cover and protect the clamp-brake 3 and the disk 2, and is formed with a vertically-bored upright bearing lO, in which a dog or stopbolt ll is adapted to be moved. An arm. l2 projects forward from the upper end of said casting or frame, and in the lowerend of said arm is fulcrumed a lever 13, the forward arm of which is provided with an adjustable weight 14, and its rear arm projects through and is adapted to be moved up'and down within vertically-aligned slots l5 and 16, formed, respectively, in the upright bearing and in the dog or stop-bolt ll. A cord or wire 17 is attached to the rear end of said lever.

A trigger or trip 13, which is provided with a forwardly-proj ect-ing wei ghted arm 19,which passes through a slot 20 in the upright casting or frame 9, with a beveled catch vor lip 2l, and with a rearwardly-projecting arm 22, is pivoted upon the rear side of the upright casting or frame and engages by its catch ory lip 21 with a beveled notch 23 in the vertically-movable dog or stop-bolt l1 when the latter is in its raised position in said upright bearing. On reference to the drawings it will be observed that ,the Weight upon the lever 13 will hold the same normally tilted forward, that the rear arm of said lever will IOO raise the vertically-movable dog or stop-bolt 1l, and that the latter will be held in its raised posit-ion by the catch or lip 2l. When the rear arm of said lever is drawn or pulled downby the cord or wire 17, it will strike the rear arm 22 of the trigger or trip 18, tilt the same, and release the dog or stop-bolt 1l, which will then drop down with its end against the periphery of the clamp-brake 3. As this clamp-brake normally revolves with the disk 2, which is rigidly secured to the shaft 1, said brake will be stopped when the end of one of its projecting casings 5 strikes the lower end of said bolt and stop the revolution of said disk. As the coiled springs 7. yieldingly hold the semicircular bands 4 of the clamp-brake upon the disk,l the latter is permitted lto slip or slide slightly within said clamp-brake after the revolution of one of said bands has been arrested by the descent of the dog or stop-bolt 11, and thus said disk and its shaft will not be suddenly arrested or stopped with an injurious jar or effect. This Vis due to the fact that the combined length vof 'the semicircular bands, apart from the slotted casings, is somewhat less than the circumference of the disk, and that the length of the slots in the casings containing the springs is sufficient to allow the latter to be compressed by the lugs 6 to an extent that will cause said bands to clamp upon the disk and gradually retard and finally stop the same; also, during this operation, as said disk continues to revolve for a short distance after the drop of the dog or stop-bolt, it will draw around with it the other semicircular band which is not in contact with said dog or stop-bolt; also, owing to the compression of its spring, it will be caused to bind gradually tighter upon said disk. Thus this short revolution or movement of said disk within the clamp brake gradually increases the frictional resistance of the latter and causes its successful operation.

Having thus fully described the construction and arrangement or combination of the several parts of my improved brake mechanism, what I claim as new is- 1. In a machine-brake, the combination,l

with a revoluble surface, of an annular twopart clamp-brake provided with springs for yieldinglyholding it against said surface and'` 3 5 surface and provided with a spring in one end j Listing-screw in one end of each, and a dog or stop-bolt for engaging and arresting said clamp-brake, substantially as described.

5. In a machine-brake, the combination, with a revoluble disk, of an annular clampbrake composed of two semicircular bands which are of less length combined than the circumference of said disk, and which are provided with adjustable springs for yieldingly holding them against said disk, and a dog or stop-bolt for engaging and arresting said clamp-brake, substantially as described.

6. In a machine-brake, the combination, with a revoluble disk, of an annular clampbrake composed ,of two semicircular bands which are of less length'combined than the circumference of said disk, and which are provided with adjustable springs for yieldingly holding them against said disk, a dog or stopbolt for engaging and arresting said clampbrake, and means for bringing said stop-bolt into contact with and removing itfrom said clamp-brake, substantially as described.

7. In a machine-brake, a revoluble disk, a clamp-brake formed intwo 'parts and surrounding said disk and provided withprojecting slotted casings and lips and with springs within said casings, in combination witha vertically-movable dog or stop-bolt, substantiall as described.

8. In a machine-brake, a revoluble disk, a clamp-brake formed in two parts and sur.- rounding said disk and provided with projecting slotted casings and lips and with springs IOO within said casings, in combination with a Vertically-movable dog or stop-bolt, a weighted lever for operating the same,`and atrigger or trip for holding and releasing it, substantially as described.

9. In a machine-brake, a revoluble disk, a clamp-brake formed in two parts and surrounding said disk and provided with projecting slotted casings and lips and with springs within said casings, in combination with a vertically-movable dog or stop-bolt formed with a vertical slot and a beveled notch, a weighted lever passing through said slot, and a trigger or trip provided with a catch or lip and with forwardly and rearwardly extending arms, substantially as described.

In testimonywhereof Iaiiix my signaturei n presence of two witnesses.

JOHN IVOLKE.

Titnessesz JOHN N. MARsH, DAN. E. PIERsoN.

IIO 

